Dictionaries and loops

Author: rayxtr

Dictionaries.py

@@ -29,3 +29,36 @@
 
 
 print(se)
+
+
+
+inventory={
+      "item1":100,
+      "item2":200,
+      "item3":300
+}
+
+inventory['item1']-=3
+print(inventory['item1'])
+
+if 'item4' not in inventory:
+      inventory['item4']=345
+      print(inventory)
+
+text = "I am a multimillionare a boy"
+word={}
+# for w in text.split():
+#       if w in word:
+#             word[w]+=1
+#       else:
+#             word[w]=1
+for w in text.split():
+    word[w]=  word.get(w,0)+1
+print(word)
+
+new_d = dict.fromkeys(word.keys(),'')
+print(new_d)
+liss = [33,44,55,32]
+dit = dict.fromkeys(liss,'yes')
+print(dit)
+

loops.ipynb

@@ -2,7 +2,7 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": null,
    "metadata": {},
    "outputs": [
     {
@@ -13,14 +13,23 @@
       "1\n",
       "2\n",
       "3\n",
-      "4\n"
+      "4\n",
+      "2\n",
+      "3\n",
+      "4\n",
+      "5\n",
+      "5\n"
      ]
     }
    ],
    "source": [
     "a = (2,3,4,5,5);\n",
     "for i in range(len(a)):\n",
-    "    print(i)"
+    "    print(i) # print index becaue using range\n",
+    "\n",
+    "    #but if using directly name of tuple\n",
+    "for x in a:\n",
+    "    print(x)  # print elements directly.\n"
    ]
   },
   {
@@ -74,6 +83,67 @@
     "\n",
     "\n"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import numpy as np\n",
+    "abc = [2,3,2,3,3,6,7]\n",
+    "\n",
+    "for i in range(0,len(abc),2):  # increment int\n",
+    "    print(i)\n",
+    "\n",
+    "for i in np.arange(0,len(abc),0.5): # increment float\n",
+    "    print(i)     "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 23,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "43\n",
+      "4\n",
+      "10\n",
+      "22\n",
+      "12\n",
+      "43\n",
+      "4\n",
+      "10\n",
+      "22\n",
+      "12\n",
+      "860 yes\n",
+      "200 yes\n",
+      "240 yes\n"
+     ]
+    }
+   ],
+   "source": [
+    "h = [12,22,10,4,43]\n",
+    "\n",
+    "for i in reversed(h):\n",
+    "    print(i)    # start printing from last index. or reverse\n",
+    "\n",
+    "for i in h[::-1]:   # same work\n",
+    "    print (i)    \n",
+    "\n",
+    "for i in range(len(h)-1,-1,-2):\n",
+    "    print(h[i]*20,'yes')\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {